Disable testDocumentBuffering failures, tracking with MIGRATIONS-2254 #418

Job	Run time
gradle-tests	52m 24s
console-python-tests (lib/console_link)	27s
python-lint	6s
console-python-tests (cluster_tools)	2m 17s
style-check	1m 22s
console-python-tests (console_api)	26s
workflow-info	3s
link-checker	4s
node-tests (./deployment/cdk/opensearch-service-migration)	41s
node-tests (./deployment/migration-assistant-solution)	22s
python-e2e-tests	15m 41s
all-ci-checks-pass	1s
	1h 13m 54s

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